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Geothermal Energy

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Fig. 13 | Geothermal Energy

Fig. 13

From: Stress sensitivity of porosity and permeability under varying hydrostatic stress conditions for different carbonate rock types of the geothermal Malm reservoir in Southern Germany

Fig. 13

Normalized stress sensitivity for different lithology and facies types. a Average permeability reduction of the tested Malm samples fits well within the range of reference data reported by various authors. The lower limit is defined by rock types with a well-connected flow network, while the upper limit is represented by rock types with a poorly developed flow-network dominated by compliant micro-cracks and elongated pores. b Results for the stress-induced porosity reduction show a discrepancy with most data from the literature and are relatively low for the Malm carbonates. Differences in the test procedure can have a significant impact on the results. See text and Fig. 14 for more details

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